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<h2>Arduino Uno</h2>
<p class="vspace"></p><table align="center" border="0"><tbody><tr><td colspan="2" valign="top"><a class="urllink" href="http://arduino.cc/en/uploads/Main/ArduinoUno_R3_Front.jpg" rel="nofollow"><img src="Arduino%20-%20ArduinoBoardUno-Dateien/ArduinoUno_R3_Front_450px.jpg" alt="" title=""></a>
</td><td colspan="2" valign="top"><a class="urllink" href="http://arduino.cc/en/uploads/Main/ArduinoUno_R3_Back.jpg" rel="nofollow"><img src="Arduino%20-%20ArduinoBoardUno-Dateien/ArduinoUno_R3_Back_450px.jpg" alt="" title=""></a>
</td></tr><tr><td colspan="2" valign="top"> <em>Arduino Uno R3 Front</em>
</td><td colspan="2" valign="top"> <em>Arduino Uno R3 Back</em>
<p class="vspace"></p></td></tr><tr><td valign="top"><a class="urllink" href="http://arduino.cc/en/uploads/Main/ArduinoUno_r2_front.jpg" rel="nofollow"><img src="Arduino%20-%20ArduinoBoardUno-Dateien/ArduinoUno_r2_front450px.jpg" alt="" title="" width="200px"></a>
</td><td valign="top"><a class="urllink" href="http://arduino.cc/en/uploads/Main/ArduinoUnoSmd.jpg" rel="nofollow"><img src="Arduino%20-%20ArduinoBoardUno-Dateien/ArduinoUnoSmd450px.jpg" alt="" title="" width="200px"></a>
</td><td valign="top"><a class="urllink" href="http://arduino.cc/en/uploads/Main/ArduinoUnoFront.jpg" rel="nofollow"><img src="Arduino%20-%20ArduinoBoardUno-Dateien/ArduinoUnoFront450px.jpg" alt="" title="" width="200px"></a>
</td><td valign="top"><a class="urllink" href="http://arduino.cc/en/uploads/Main/ArduinoUnoBack.jpg" rel="nofollow"><img src="Arduino%20-%20ArduinoBoardUno-Dateien/ArduinoUnoBack450px.jpg" alt="" title="" width="193pxt"></a>
<p class="vspace"></p></td></tr><tr><td valign="top"> <em>Arduino Uno R2 Front</em>
</td><td valign="top"> <em>Arduino Uno SMD</em>
</td><td valign="top"> <em>Arduino Uno Front</em>
</td><td valign="top"> <em>Arduino Uno Back</em>
<p class="vspace"></p></td></tr></tbody></table>
<p class="vspace"></p>
<table border="0"><tbody><tr><td valign="top"><br><a class="urllink" href="http://store.arduino.cc/index.php?main_page=product_info&amp;cPath=11&amp;products_id=195" rel="nofollow"><img src="Arduino%20-%20ArduinoBoardUno-Dateien/buttonStore.jpg" alt="" title=""></a>
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</td></tr></tbody></table>
<p class="vspace"></p><h3>Overview</h3>
<p>The Arduino Uno is a microcontroller board based on the <span class="wikiword">ATmega328</span> (<a target="_blank" class="urllink" href="http://www.atmel.com/dyn/resources/prod_documents/doc8161.pdf" rel="nofollow">datasheet</a>).  It has 14 digital input/output pins (of which 6 can be used as PWM outputs), 6 analog inputs, a 16 <span class="wikiword">MHz</span>
 ceramic resonator, a USB connection, a power jack, an ICSP header, and a
 reset button.  It contains everything needed to support the 
microcontroller; simply connect it to a computer with a USB cable or 
power it with a AC-to-DC adapter or battery to get started.
</p>
<p class="vspace"></p><p>The Uno differs from all preceding boards in that it does not use the FTDI USB-to-serial driver chip. Instead, it features the <span class="wikiword">Atmega16U2</span> (<span class="wikiword">Atmega8U2</span> up to version R2) programmed as a USB-to-serial converter.<br><ins>Revision 2</ins> of the Uno board has a resistor pulling the 8U2 HWB line to ground, making it easier to put into <a class="wikilink" href="http://arduino.cc/en/Hacking/DFUProgramming8U2">DFU mode</a>.<br><ins>Revision 3</ins> of the board has the following new features:
</p><ul><li> 1.0 pinout: added SDA and SCL pins that are near to the 
AREF pin and two other new pins placed near to the RESET pin, the IOREF 
that allow the shields to adapt to the voltage provided from the board. 
In future, shields will be compatible with both the board that uses the 
AVR, which operates with 5V and with the Arduino Due that operates with 
3.3V. The second one is a not connected pin, that is reserved for future
 purposes.
</li><li>Stronger RESET circuit.
</li><li>Atmega 16U2 replace the 8U2.
</li></ul><p class="vspace"></p><p>"Uno" means one in Italian and is 
named to mark the upcoming release of Arduino 1.0. The Uno and version 
1.0 will be the reference versions of Arduino, moving forward.  The Uno 
is the latest in a series of USB Arduino boards, and the reference model
 for the Arduino platform; for a comparison with previous versions, see 
the <a class="wikilink" href="http://arduino.cc/en/Main/Boards">index of Arduino boards</a>.
</p>
<p class="vspace"></p><h3>Summary</h3>
<table border="0"><tbody><tr><td align="left">Microcontroller</td><td align="left"><span class="wikiword">ATmega328</span></td></tr>
<tr><td align="left">Operating Voltage</td><td align="left">5V</td></tr>
<tr><td align="left">Input Voltage (recommended)</td><td align="left">7-12V</td></tr>
<tr><td align="left">Input Voltage (limits)</td><td align="left">6-20V</td></tr>
<tr><td align="left">Digital I/O Pins</td><td align="left">14  (of which 6 provide PWM output)</td></tr>
<tr><td align="left">Analog Input Pins</td><td align="left">6</td></tr>
<tr><td align="left">DC Current per I/O Pin</td><td align="left">40 mA</td></tr>
<tr><td align="left">DC Current for 3.3V Pin</td><td align="left">50 mA</td></tr>
<tr><td align="left">Flash Memory</td><td align="left">32 KB (<span class="wikiword">ATmega328</span>) of which 0.5 KB used by bootloader</td></tr>
<tr><td align="left">SRAM</td><td align="left">2 KB (<span class="wikiword">ATmega328</span>)</td></tr>
<tr><td align="left">EEPROM</td><td align="left">1 KB (<span class="wikiword">ATmega328</span>)</td></tr>
<tr><td align="left">Clock Speed</td><td align="left">16 <span class="wikiword">MHz</span></td></tr>
</tbody></table>
<p class="vspace"></p><h3>Schematic &amp; Reference Design</h3>
<p>EAGLE files: <a class="urllink" href="http://arduino.cc/en/uploads/Main/arduino_Uno_Rev3-02-TH.zip" rel="nofollow">arduino-uno-Rev3-reference-design.zip</a> (NOTE: works with Eagle 6.0 and newer)
</p>
<p class="vspace"></p><p>Schematic: <a class="urllink" href="http://arduino.cc/en/uploads/Main/Arduino_Uno_Rev3-schematic.pdf" rel="nofollow">arduino-uno-Rev3-schematic.pdf</a>
</p>
<p class="vspace"></p><p><strong>Note:</strong> The Arduino reference design can use an Atmega8, 168, or 328, Current models use an <span class="wikiword">ATmega328</span>, but an Atmega8 is shown in the schematic for reference. The pin configuration is identical on all three processors.
</p>
<p class="vspace"></p><h3>Power</h3>
<p>The Arduino Uno can be powered via the USB connection or with an 
external power supply.  The power source is selected automatically.
</p>
<p class="vspace"></p><p>External (non-USB) power can come either from 
an AC-to-DC adapter (wall-wart) or battery.  The adapter can be 
connected by plugging a 2.1mm center-positive plug into the board's 
power jack.  Leads from a battery can be inserted in the Gnd and Vin pin
 headers of the POWER connector.  
</p>
<p class="vspace"></p><p>The board can operate on an external supply of 6
 to 20 volts.  If supplied with less than 7V, however, the 5V pin may 
supply less than five volts and the board may be unstable.  If using 
more than 12V, the voltage regulator may overheat and damage the board. 
 The recommended range is 7 to 12 volts.
</p>
<p class="vspace"></p><p>The power pins are as follows:
</p>
<p class="vspace"></p><ul><li><strong>VIN.</strong>  The input voltage 
to the Arduino board when it's using an external power source (as 
opposed to 5 volts from the USB connection or other regulated power 
source).  You can supply voltage through this pin, or, if supplying 
voltage via the power jack, access it through this pin.  
<p class="vspace"></p></li><li><strong>5V.</strong>This pin outputs a 
regulated 5V from the regulator on the board.  The board can be supplied
 with power either from the DC power jack (7 - 12V), the USB connector 
(5V), or the VIN pin of the board (7-12V).  Supplying voltage via the 5V
 or 3.3V pins bypasses the regulator, and can damage your board. We 
don't advise it.
<p class="vspace"></p></li><li><strong>3V3.</strong>  A 3.3 volt supply generated by the on-board regulator.  Maximum current draw is 50 mA.
<p class="vspace"></p></li><li><strong>GND.</strong> Ground pins.  
<p class="vspace"></p></li><li><strong>IOREF.</strong> This pin on the 
Arduino board provides the voltage reference with which the 
microcontroller operates. A properly configured shield can read the 
IOREF pin voltage and select the appropriate power source or enable 
voltage translators on the outputs for working with the 5V or 3.3V.
</li></ul><p class="vspace"></p><h3>Memory</h3>
<p>The <span class="wikiword">ATmega328</span> has 32 KB (with 0.5 KB 
used for the bootloader). It also has 2 KB of SRAM and 1 KB of EEPROM 
(which can be read and written with the <a class="urllink" href="http://www.arduino.cc/en/Reference/EEPROM" rel="nofollow">EEPROM library</a>).
</p>
<p class="vspace"></p><h3>Input and Output</h3>
<p>Each of the 14 digital pins on the Uno can be used as an input or output, using <a class="wikilink" href="http://arduino.cc/en/Reference/PinMode">pinMode()</a>, <a class="wikilink" href="http://arduino.cc/en/Reference/DigitalWrite">digitalWrite()</a>, and <a class="wikilink" href="http://arduino.cc/en/Reference/DigitalRead">digitalRead()</a>
 functions.  They operate at 5 volts.  Each pin can provide or receive a
 maximum of 40 mA and has an internal pull-up resistor (disconnected by 
default) of 20-50 kOhms.  In addition, some pins have specialized 
functions:
</p>
<p class="vspace"></p><ul><li><strong>Serial: 0 (RX) and 1 (TX).</strong>  Used to receive (RX) and transmit (TX) TTL serial data.  These pins are connected to the corresponding pins of the <span class="wikiword">ATmega8U2</span> USB-to-TTL Serial chip.  
<p class="vspace"></p></li><li><strong>External Interrupts: 2 and 3.</strong> These pins can be configured to trigger an interrupt on a low value, a rising or falling edge, or a change in value.  See the <a class="wikilink" href="http://arduino.cc/en/Reference/AttachInterrupt">attachInterrupt()</a> function for details.
<p class="vspace"></p></li><li><strong>PWM: 3, 5, 6, 9, 10, and 11.</strong>  Provide 8-bit PWM output with the <a class="wikilink" href="http://arduino.cc/en/Reference/AnalogWrite">analogWrite()</a> function.  
<p class="vspace"></p></li><li><strong>SPI: 10 (SS), 11 (MOSI), 12 (MISO), 13 (SCK).</strong>  These pins support SPI communication using the <a class="wikilink" href="http://arduino.cc/en/Reference/SPI">SPI library</a>.
<p class="vspace"></p></li><li><strong>LED: 13.</strong> There is a built-in LED connected to digital pin 13.  When the pin is HIGH value, the LED is on, when the pin is LOW, it's off.
</li></ul><p class="vspace"></p><p>The Uno has 6 analog inputs, labeled 
A0 through A5, each of which provide 10 bits of resolution (i.e. 1024 
different values).  By default they measure from ground to 5 volts, 
though is it possible to change the upper end of their range using the 
AREF pin and the <a class="wikilink" href="http://arduino.cc/en/Reference/AnalogReference">analogReference</a>() function.  Additionally, some pins have specialized functionality:
</p>
<p class="vspace"></p><ul><li><strong>TWI: A4 or SDA pin and A5 or SCL pin.</strong>  Support TWI communication using the <a class="wikilink" href="http://arduino.cc/en/Reference/Wire">Wire library</a>.
</li></ul><p class="vspace"></p><p>There are a couple of other pins on the board:
</p>
<p class="vspace"></p><ul><li><strong>AREF.</strong> Reference voltage for the analog inputs.  Used with <a class="wikilink" href="http://arduino.cc/en/Reference/AnalogReference">analogReference</a>().
<p class="vspace"></p></li><li><strong>Reset.</strong> Bring this line 
LOW to reset the microcontroller.  Typically used to add a reset button 
to shields which block the one on the board.
</li></ul><p class="vspace"></p><p>See also the <a class="wikilink" href="http://arduino.cc/en/Hacking/PinMapping168">mapping between Arduino pins and ATmega328 ports</a>. The mapping for the Atmega8, 168, and 328 is identical.
</p>
<p class="vspace"></p><h3>Communication</h3>
<p>The Arduino Uno has a number of facilities for communicating with a computer, another Arduino, or other microcontrollers.  The <span class="wikiword">ATmega328</span> provides UART TTL (5V) serial communication, which is available on digital pins 0 (RX) and 1 (TX).  An <span class="wikiword">ATmega16U2</span>
 on the board channels this serial communication over USB and appears as
 a virtual com port to software on the computer.  The '16U2 firmware 
uses the standard USB COM drivers, and no external driver is needed. 
However, <a class="urllink" href="http://arduino.cc/en/Guide/Windows#toc4" rel="nofollow">on Windows, a .inf file is required</a>.
  The Arduino software includes a serial monitor which allows simple 
textual data to be sent to and from the Arduino board.  The RX and TX <span class="wikiword">LEDs</span>
 on the board will flash when data is being transmitted via the 
USB-to-serial chip and USB connection to the computer (but not for 
serial communication on pins 0 and 1).
</p>
<p class="vspace"></p><p>A <a class="urllink" href="http://www.arduino.cc/en/Reference/SoftwareSerial" rel="nofollow">SoftwareSerial library</a> allows for serial communication on any of the Uno's digital pins.
</p>
<p class="vspace"></p><p>The <span class="wikiword">ATmega328</span> also supports <span class="wikiword">I2C</span> (TWI) and SPI communication.  The Arduino software includes a Wire library to simplify use of the <span class="wikiword">I2C</span> bus; see the <a class="wikilink" href="http://arduino.cc/en/Reference/Wire">documentation</a> for details.  For SPI communication, use the <a class="wikilink" href="http://arduino.cc/en/Reference/SPI">SPI library</a>.
</p>
<p class="vspace"></p><h3>Programming</h3>
<p>The Arduino Uno can be programmed with the Arduino software (<a class="wikilink" href="http://arduino.cc/en/Main/Software">download</a>).  Select "Arduino Uno from the <strong>Tools &gt; Board</strong> menu (according to the microcontroller on your board).  For details, see the <a class="wikilink" href="http://arduino.cc/en/Reference/HomePage">reference</a> and <a class="wikilink" href="http://arduino.cc/en/Tutorial/HomePage">tutorials</a>.
</p>
<p class="vspace"></p><p>The <span class="wikiword">ATmega328</span> on the Arduino Uno comes preburned with a <a class="wikilink" href="http://arduino.cc/en/Tutorial/Bootloader">bootloader</a>
 that allows you to upload new code to it without the use of an external
 hardware programmer.  It communicates using the original <span class="wikiword">STK500</span> protocol (<a target="_blank" class="urllink" href="http://www.atmel.com/dyn/resources/prod_documents/doc2525.pdf" rel="nofollow">reference</a>, <a target="_blank" class="urllink" href="http://www.atmel.com/dyn/resources/prod_documents/avr061.zip" rel="nofollow">C header files</a>).
</p>
<p class="vspace"></p><p>You can also bypass the bootloader and program 
the microcontroller through the ICSP (In-Circuit Serial Programming) 
header using <a class="wikilink" href="http://arduino.cc/en/Main/ArduinoISP">Arduino ISP</a> or similar; see <a class="wikilink" href="http://arduino.cc/en/Hacking/Programmer">these instructions</a> for details.
</p>
<p class="vspace"></p><p>The <span class="wikiword">ATmega16U2</span> (or 8U2 in the rev1 and rev2 boards) firmware source code is available .  The <span class="wikiword">ATmega16U2</span>/8U2 is loaded with a DFU bootloader, which can be activated by:
</p><ul><li>On Rev1 boards: connecting the solder jumper on the back of the board (near the map of Italy) and then resetting the 8U2.  
</li><li>On Rev2 or later boards: there is a resistor that pulling the 
8U2/16U2 HWB line to ground, making it easier to put into DFU mode.
</li></ul><p>You can then use <a target="_blank" class="urllink" href="http://www.atmel.com/dyn/products/tools_card.asp?tool_id=3886" rel="nofollow">Atmel's FLIP software</a> (Windows) or the <a target="_blank" class="urllink" href="http://dfu-programmer.sourceforge.net/" rel="nofollow">DFU programmer</a>
 (Mac OS X and Linux) to load a new firmware.  Or you can use the ISP 
header with an external programmer (overwriting the DFU bootloader).  
See <a class="urllink" href="http://www.arduino.cc/cgi-bin/yabb2/YaBB.pl?num=1285962838" rel="nofollow">this user-contributed tutorial</a> for more information.
</p>
<p class="vspace"></p><h3>Automatic (Software) Reset</h3>
<p>Rather than requiring a physical press of the reset button before an 
upload, the Arduino Uno is designed in a way that allows it to be reset 
by software running on a connected computer.  One of the hardware flow 
control lines (DTR) of the <span class="wikiword">ATmega8U2</span>/16U2 is connected to the reset line of the  <span class="wikiword">ATmega328</span>
 via a 100 nanofarad capacitor.  When this line is asserted (taken low),
 the reset line drops long enough to reset the chip.  The Arduino 
software uses this capability to allow you to upload code by simply 
pressing the upload button in the Arduino environment.  This means that 
the bootloader can have a shorter timeout, as the lowering of DTR can be
 well-coordinated with the start of the upload.  
</p>
<p class="vspace"></p><p>This setup has other implications.  When the 
Uno is connected to either a computer running Mac OS X or Linux, it 
resets each time a connection is made to it from software (via USB).  
For the following half-second or so, the bootloader is running on the 
Uno.  While it is programmed to ignore malformed data (i.e. anything 
besides an upload of new code), it will intercept the first few bytes of
 data sent to the board after a connection is opened.  If a sketch 
running on the board receives one-time configuration or other data when 
it first starts, make sure that the software with which it communicates 
waits a second after opening the connection and before sending this 
data.
</p>
<p class="vspace"></p><p>The Uno contains a trace that can be cut to 
disable the auto-reset.  The pads on either side of the trace can be 
soldered together to re-enable it.  It's labeled "RESET-EN".  You may 
also be able to disable the auto-reset by connecting a 110 ohm resistor 
from 5V to the reset line; see <a class="urllink" href="http://www.arduino.cc/cgi-bin/yabb2/YaBB.pl?num=1213719666/all" rel="nofollow">this forum thread</a> for details.
</p>
<p class="vspace"></p><h3>USB Overcurrent Protection</h3>
<p>The Arduino Uno has a resettable polyfuse that protects your 
computer's USB ports from shorts and overcurrent.  Although most 
computers provide their own internal protection, the fuse provides an 
extra layer of protection.  If more than 500 mA is applied to the USB 
port, the fuse will automatically break the connection until the short 
or overload is removed.  
</p>
<p class="vspace"></p><h3>Physical Characteristics</h3>
<p>The maximum length and width of the Uno PCB are 2.7 and 2.1 inches 
respectively, with the USB connector and power jack extending beyond the
 former dimension.  Four screw holes allow the board to be attached to a
 surface or case.  Note that the distance between digital pins 7 and 8 
is 160 mil (0.16"), not an even multiple of the 100 mil spacing of the 
other pins.
</p>
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